Primitive-Polynomial Sidelink PSS/SSS Sequences for Signal Distinction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The 5G sidelink communication system lacks a clear definition of synchronization reference and synchronization signal sequence, which hinders the performance of distinguishing downlink synchronization signals and increases complexity in generating these signals.
Innovation Solution
A method and apparatus for generating and transmitting M-sequence based sidelink primary and secondary synchronization signals (PSS and SSS) by determining sidelink identifier values and applying cyclic shifts to primitive polynomials, ensuring distinct sequences for sidelink and downlink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronization signal sequences are generated without clear definitions, then system implementation is simpler, but signal distinction performance deteriorates and generation complexity increases
Solution Approach 1:
The patent applies parameter changes by defining specific primitive polynomials (x^7+x+1 and x^7+x^3+1) and their corresponding initialization values (1 and 2) to generate distinct synchronization signal sequences. By changing these mathematical parameters, the system achieves clear signal distinction without increasing implementation complexity, as the sequences are generated through standardized polynomial operations.
Solution Approach 2:
The patent uses copying by generating sidelink synchronization signals based on established downlink synchronization signal structures. The same primitive polynomial frameworks are copied and adapted for sidelink use, with specific initialization values assigned to differentiate the signals. This copying approach maintains generation simplicity while achieving signal distinction.
2Ease of manufacture
If the same primitive polynomials are used for both downlink and sidelink signals, then signal generation is simpler, but signal distinction capability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different initialization values (1 for downlink, 2 for sidelink) while using the same primitive polynomial framework. This creates locally differentiated signals within a unified structure, allowing easy generation through a single codebase while maintaining clear distinction between downlink and sidelink signals through the initialization value parameter.
3Reliability
If synchronization references are not clearly defined, then system deployment is faster, but communication reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining the synchronization reference as the downlink synchronization signal and pre-establishing the mapping between downlink and sidelink synchronization signals. This preliminary definition eliminates the need for complex runtime synchronization reference determination, allowing faster deployment while ensuring communication reliability through a clear, predetermined synchronization framework.
Data Source
AI summary
The present disclosure relates to a method and apparatus for transmitting and receiving a sidelink synchronization signal in a wireless communication system. A method of transmitting, by a first user equipment (UE), a sidelink synchronization signal to a second UE in a wireless communication system according to an example of the present disclosure may include determining values of NID(1) and NID(2) corresponding to a sidelink identifier (SLID) value based on a number of types of a physical layer sidelink synchronization identity set and a number of sequences included in each type of the physical layer sidelink synchronization identity set; generating a sidelink primary synchronization signal (PSS) sequence and a sidelink secondary synchronization signal (SSS) sequence based on a first primitive polynomial, a second primitive polynomial, and a cyclic shift (CS) value; and mapping, on physical resources, and thereby transmitting the sidelink PSS sequence and the sidelink SSS sequence.